Right on time, the Left 4 Dead PC demo has been released via Steam and is now accessible to those that have pre-ordered the game. The demo will be provided to the non-pre-ordering public come November 11, with the game itself due November 18.

The company expects the demo to go live at 2 AM PST on Xbox 360, with the PC version hitting five hours later at 7 AM PST. The trial includes the first two levels of the hospital-themed No Mercy campaign, playable in both online and offline co-op mode.

Early access to the demo can only be gained by pre-ordering the title, either from Steam or GameStop/EB Games. The same pre-order promotion also offers a 10% discount on the game.